Monsters of the Paleozoic: sea scorpions
Eupteryds are an extinct group of Paleozoic aquatic arthropods.
The lesson introduces you to various types of teeth and their functions.
The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
A monogamous species of ape living on the trees.
Many freshwater fishes are also popular as food.
The best known cartilaginous fish, sharks, do not chew their food; they use their razor-sharp...
Chameleons are reptiles with an ability to change their colors.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
This animation demonstrates birds' bones and eggs through the example of the common...